Apple, Walnut & Maple Cake-Crumble

New Hampshire’s iconic Old Man of the Mountain crumbled into a heap in May 2003, but his image remains on all the state road signs and license plates. This recipe is an homage to him, as well as a wonderful showcase for New Hampshire apples and maple syrup. Joan likes to make the crumble with terrific New Hampshire blueberries when they’re in season.